WO2021196487A1

WO2021196487A1 - Upper-drive-type main shaft composite body for centrifugal supergravity device

Info

Publication number: WO2021196487A1
Application number: PCT/CN2020/107736
Authority: WO
Inventors: 韦华; 张泽; 陈云敏; 林伟岸
Original assignee: 浙江大学
Priority date: 2020-04-03
Filing date: 2020-08-07
Publication date: 2021-10-07
Also published as: CN111486169A; CN111486169B

Abstract

An upper-drive-type main shaft composite body for a centrifugal supergravity device. The upper end of a main shaft (59) is coaxially and fixedly connected to the lower end of a slip ring shaft (52), and the upper end of the slip ring shaft (52) has a slip ring (51) sleeved thereon; a magnetic fluid sealing structure (511) and a sealing flange (513) are mounted at the middle of the main shaft (59); the magnetic fluid sealing structure (511) comprises a bearing cover (511-2), a deep-groove ball bearing (511-3), a housing (511-4) and an O-shaped ring (511-7); an annular notch groove is provided at the circumferential surface of an inner ring at the top of the sealing flange (513), an oil seal (513-1) is mounted in the annular notch groove, an elastic check ring (513-2) for a hole is arranged on the upper side of the oil seal (513-1), an annular groove is provided in a surface of an annular step of the sealing flange (513), and a sealing ring (513-3) is mounted in the annular groove; and the lower end of the main shaft (59) is coaxially and fixedly connected to a connecting flange (515) by means of an expansion sleeve (516). The upper-drive-type main shaft composite body solves the key problem of a lower-drive-type main shaft composite body wherein same cannot achieve automatic leveling and load active separation from a main shaft under a high-rotating-speed, high-load and vacuum environment; and same can meet working conditions of different rotating speeds, is suitable for special working conditions of a long time, a high vacuum and an excessive rotating speed, and can achieve an automatic leveling function of a load under the action of the gravity thereof.

Description

Up-drive spindle complex for centrifugal supergravity device

Technical field

The invention relates to a centrifugal supergravity main shaft in the technical field of main shafts and bearings, and in particular to an upper-drive main shaft complex for a centrifugal supergravity device.

Background technique

Use supergravity to accelerate the relative motion effect of multiphase media, and supergravity to simulate the scale effect, time-lapse effect and enhanced energy effect of the supergravity simulation of the normal gravity process. The supergravity centrifuge is equipped with a vibrating table, an autoclave, a melting furnace, a high-pressure and high-temperature chamber, etc. The airborne experimental device reveals new phenomena and new laws in it. For this reason, researchers in the fields of deep earth, geology, materials, etc., in order to use the ultra-gravity centrifugal simulation experimental device to complete scientific experiments, it is necessary to install some specific experimental devices or instruments on the ultra-gravity centrifugal simulation experimental device, such as high-temperature and high-pressure devices, Casting furnace, material mechanical property testing device, etc. However, because the ultragravity centrifugal simulation experimental device is in a high-speed rotation state when it is working, in order to ensure the safe operation of a specific experimental device or instrument on the centrifuge, the main shaft of the centrifugal ultragravity device is very critical.

In order to achieve ultra-heavy-load high-gravity experiments at high speeds, the existing down-drive spindle complex can only reduce wind resistance by increasing the vacuum degree, but because the torque output of the spindle complex is on the main shaft, it dynamically balances the super-loaded spindle Leveling brings difficulties, especially when the speed is close to the resonance point of the system, the "top-heavy" structure is very dangerous. In the event of an accident, effective measures cannot be taken to protect the spindle from damage.

Summary of the invention

In order to solve the key problem that the 17a-drive spindle complex cannot achieve automatic leveling and the load cannot be automatically separated from the spindle in the event of an accident under the environment of rotation speed greater than 50,000 revolutions/min, load exceeding 500 kg, and 10 ^{-2 Pa, the present invention provides a} This kind of upper-drive spindle complex with simple assembly, convenient use and high safety factor has simple structure, convenient installation and parts replacement, and is safe and reliable when working at high speed.

The present invention adopts the following technical solutions:

The invention includes a slip ring, a slip ring shaft, a main shaft, a small belt wheel, a magnetic fluid sealing structure, a sealing flange, a connecting flange and an expansion sleeve.

The upper end of the main shaft and the lower end of the slip ring shaft are coaxially fixed, and the upper end of the slip ring shaft is fitted with a slip ring; the middle of the main shaft is fitted with a magnetic fluid sealing structure and a sealing flange from top to bottom; the magnetic fluid sealing structure includes a bearing cover and a deep groove ball Bearing, housing and O-ring; the housing is sleeved outside the main shaft, and there is a radial gap between the housing and the middle of the main shaft to form a swimming cavity. Deep groove ball bearings are installed on the upper and lower sides of the swimming cavity, making The shell and the main shaft are rotatably connected by a deep groove ball bearing. The shell at the upper port of the swimming cavity is opened and is equipped with a bearing cover. The bearing cover is sleeved on the main shaft and axially limits the deep groove ball bearing; The lower end of the shell is closed to form a closed end, and the closed end of the lower end of the shell is sealed to the main shaft; the lower end of the shell is provided with an outer flange, and the outer flange has a connecting hole, and the bolt passes through the connecting hole to connect to the centrifugal supergravity The top plate of the experiment chamber of the device, so that the lower end of the shell is fixedly connected to the top plate of the centrifugal supergravity experiment chamber, and the lower end of the shell is provided with an annular groove, and an O-ring is installed in the annular groove. The lower end surface of the shell is in a sealed fit with the top surface of the top plate of the experiment cavity.

The sealing flange is provided with an annular notch groove on the peripheral surface of the top inner ring, an oil seal is installed in the annular notch groove, and an elastic retaining ring for the hole is arranged on the upper side of the oil seal, and the hole is embedded in the inner circumference of the annular notch groove of the sealing flange The top surface of the sealing flange is provided with an annular step, the surface of the annular step is provided with an annular groove, and the sealing ring is installed in the annular groove. The sealing ring makes the top surface of the sealing flange and the centrifugal supergravity The bottom surface of the top plate of the experiment cavity is sealed and matched; the lower end of the main shaft is coaxially fixed with the connecting flange through the expansion sleeve, and the lower end of the connecting flange is connected to the rotor system of the centrifugal supergravity device.

The main shaft above the magnetic fluid seal structure is partially provided with an annular outer flange as the collar portion, the outer peripheral surface of the collar portion is set as an outer conical surface inclined downward, and the inner peripheral surface of the small pulley is set inclined downward The inner conical surface of the small pulley is coaxially sleeved on the collar part of the main shaft through the inner and outer conical surfaces.

The oil seal is SKF fluorine rubber oil seal.

The invention can meet the working environment of different rotation speeds, has strong adaptability and expansibility, is suitable for the special working environment of long time, high vacuum, and super rotation speed, and can realize the automatic leveling function of the load under the action of its own gravity; When the speed is high, it solves the key problems that the down-drive spindle complex cannot realize automatic leveling and the load is actively separated from the spindle under high speed, high load, and vacuum environment.

The invention is mainly suitable for high-speed rotating environment with a rotation speed of more than 50,000 rpm/min. It can carry loads with a weight of more than 500kg. At the same time ^{, it has the feasibility of using in a 10 -2} Pa high vacuum environment, and has the ability to pass the load at a low speed. The ability of automatic leveling also has the function of automatically separating the load from the spindle in the event of an accident. The structure is modular in design, easy to install and disassemble, and has strong adaptability and expandability.

The technical scheme adopted by the present invention:

The magnetic fluid sealing structure, sealing flange and oil seal of the present invention constitute the sealing and lubrication system of the spindle complex. The sealing flange and the oil seal are used to achieve primary sealing. When their sealing effect cannot meet the high vacuum requirements of ^{10 -2 Pa, the magnetic} The fluid sealing structure can achieve secondary sealing and solve the key problem that the existing spindle cannot meet special requirements such as overload protection and high vacuum at the same time under high-speed rotation, so that the spindle complex of the invention can adapt to vacuum, non-vacuum, dynamic sealing, etc. This kind of working conditions has the characteristics of a wide range of applications. If the spindle complex works under non-vacuum conditions, the magnetic fluid sealing structure can be eliminated.

In the present invention, the connecting flange and the expansion sleeve are connected to the rotor system of the airborne device of the centrifugal supergravity device. This structure enables the connecting flange and the expansion sleeve to be directly connected to the load. Under the gravity of the load, the main shaft The shaft center can automatically find the balance; after the load is installed, the dynamic balance of the rotor system and the spindle system is adjusted at a low speed; because the connecting flange is a free end, in the case of high speed, the rotor system and the end of the spindle can shake freely. Avoid the formation of an over statically determinate structure, so as to achieve dynamic balance again at high speeds, which is conducive to the safe operation of the upper-drive spindle complex for a long time at high speeds and over-heavy loads.

In the present invention, the connecting flange and the expansion sleeve are connected with the rotor system of the airborne device of the centrifugal supergravity device. This structure makes the connecting flange and the expansion sleeve directly connected with the load. During the high-speed test, once the load is damaged or accidentally caused by the centrifugal action, if the tension sleeve connected to the main shaft exceeds the design requirements in an instant, the inner and outer sleeves of the expansion sleeve expand and contract, reducing the main shaft and the expansion sleeve 51 The friction force generated by the containment surface protects the spindle by rotating the spindle and the expansion sleeve at different speeds. When the weight of the rotor system is greater than the friction generated by the containment surface of the expansion sleeve 51, the rotor system will automatically fall off from the main shaft under the action of gravity and directly fall to the bottom of the experimental cabin; after the main shaft complex is empty, under the action of its own gravity, Automatically restore balance and avoid damage. This structure is easy to install and disassemble. When the main shaft is overloaded or accident occurs, the connection with the transmission system of the centrifugal supergravity device is automatically lost through the expansion sleeve, so that the main shaft complex is protected from damage.

The small belt wheel of the present invention is connected with the transmission system of the centrifugal supergravity device, and the transmission ratio of the small belt wheel can be adjusted to meet the environment of different rotation speeds according to needs, and has strong adaptability and expandability.

The beneficial effects and features of the present invention are:

The upper-drive spindle complex of the present invention adopts a magnetic fluid sealing structure and a sealing flange split sealing structure, which is beneficial to flexibly expand the functions of non-vacuum, low vacuum, and high vacuum according to the vacuum requirements required by the experiment and/or The combination of functions is conducive to meeting various vacuum requirements at high speeds.

The upper-drive spindle complex of the present invention can detect and track various signals in the experiment process on-line in real time by being equipped with a high-speed slip ring.

In the upper-drive spindle complex of the present invention, the lower end of the spindle is coaxially fixed by the expansion sleeve and the connecting flange, which solves the problem that the lower-drive spindle complex cannot achieve automatic leveling and active load balance under high-speed, high-load, and vacuum environments. The key problem of the main shaft detachment can meet the working environment of different speeds, suitable for the special working environment of long time, high vacuum, and super speed, and can realize the automatic leveling function of the load under the action of its own gravity.

The upper-drive main shaft complex of the present invention is convenient to install and disassemble, and when the main shaft is overloaded or accident occurs, the main shaft complex can be prevented from being damaged by automatic disconnection; the transmission ratio of the small pulley can be adjusted to meet different speed conditions Environment; can adapt to airborne devices with different weights at different speeds.

The up-driving spindle complex of the present invention is suitable for vacuum, non-vacuum, dynamic sealing and other working conditions under the working conditions of rotation speed greater than 50,000 rpm and load exceeding 500kg, and has the characteristics of wide application range, and solves the problem of 17a down-driving The main problem is that the main shaft complex cannot achieve automatic leveling and the load is actively separated from the main shaft 59.

Description of the drawings

Figure 1 is a cross-sectional view of the structure of the up-drive spindle complex;

Figure 2 is a structural diagram of the spindle;

Figure 3 is a partial connection structure diagram of the slip ring shaft and the main shaft;

Figure 4 is a structural cross-sectional view of the magnetic fluid sealing structure;

Figure 5 is a structural sectional view of the sealing flange;

Figure 6 is a sectional view of the structure of the small pulley.

The reference signs in the figure are as follows: slip ring 51, slip ring shaft 52, main shaft 59, small pulley 510, magnetic fluid sealing structure 511, sealing flange 513, connecting flange 515, expansion sleeve 516; 511-2 bearing Cover; 511-3 deep groove ball bearing; 511-4 housing; 511-5 swimming cavity; 511-6 connecting hole; 511-7O ring; 513-1 oil seal; 513-2 hole with elastic retaining ring; 513 -3 Sealing ring.

Detailed ways

The present invention will be further described below in conjunction with the drawings and specific implementations.

As shown in Figure 1, the specific implementation includes slip ring 51, slip ring shaft 52, main shaft 59, small pulley 510, magnetic fluid sealing structure 511, sealing flange 513, connecting flange 515 and expansion sleeve 516; Figure 3 As shown, the upper end of the main shaft 59 and the lower end of the slip ring shaft 52 are coaxially fixed, and the upper end of the slip ring shaft 52 is fitted with a slip ring 51; Power, communication and gas supply. The inner rotor of the slip ring 51 is fastened and sleeved on the slip ring shaft 52, the inner rotor of the slip ring 51 rotates with the main shaft 59, and the slip ring 51 can be easily replaced as needed; the outer rotor of the slip ring 51 is fixed in the experimental cavity The inner top surface.

As shown in FIG. 1, a magnetic fluid sealing structure 511 and a sealing flange 513 are sequentially sheathed in the middle of the main shaft 59 from top to bottom.

As shown in Figure 4, the magnetic fluid sealing structure 511 includes a bearing cover 511-2, a deep groove ball bearing 511-3, a housing 511-4 and an O-ring 511-7; the housing 511-4 is sleeved outside the main shaft 59, There is a radial gap between the housing 511-4 and the middle of the main shaft 59 to form a swimming cavity 511-5. The bearing seat 511 is sealed and fixed on the end surface of the central through hole of the top plate of the centrifugal supergravity experiment chamber. Deep groove ball bearings 511-3 are installed on the lower side, so that the housing 511-4 and the main shaft 59 are rotatably connected by the deep groove ball bearings 511-3, and the housing 511-4 at the upper port of the floating cavity 511-5 A bearing cover 511-2 is opened and installed. The bearing cover 511-2 is sleeved outside the main shaft 59 and axially limits the deep groove ball bearing 511-3; the housing 511-4 is formed by closing the housing 511-4 at the lower end Closed end, sealed connection between the closed end of the lower end of the housing 511-4 and the main shaft 59;

The lower end of the shell 511-4 is provided with an outer flange, and the outer flange is provided with a connecting hole 511-6. The lower end portion of the tube is fixedly connected to the top plate of the centrifugal supergravity experiment chamber, so that the magnetic fluid sealing structure 511 is fixed to the centrifugal supergravity device through the connecting hole 511-6. And the lower end surface of the housing 511-4 is provided with an annular groove, an O-ring 511-7 is installed in the annular groove, and the lower end surface of the housing 511-4 and the top surface of the experimental cavity Hermetic fit

The magnetic fluid seal structure 511, the main shaft 59 and the small pulley 510 constitute a fixed-swimming support structure. This fixed-swimming support structure design can compensate for the length change of the main shaft 59 caused by thermal deformation and manufacturing and installation errors.

The main shaft 59 is a composite body that transmits torque and is an important part of the main shaft composite body. Different material types can be selected according to the transmitted torque, but the material must have strong strength and toughness.

The magnetic fluid seal structure 511 provides a high-level dynamic seal for the main shaft 59, and the magnet and the magnetic shoe ring used to generate the magnetic fluid seal are placed in the swimming cavity 511-5. The magnetic fluid sealing structure 511 is connected to the main shaft 59 through the mounting hole 511-1. The main shaft 59 and the magnetic fluid sealing structure 511 are connected by a pair of angular contact ball bearings 511-3; the angular contact ball bearings 511-3 are arranged back-to-back, with fulcrums The span is larger, the cantilever length is smaller, and the support rigidity of the cantilever end is larger.

As shown in Figure 5, the sealing flange 513 is provided with an annular notch groove on the peripheral surface of the top inner ring. An oil seal 513-1 is installed in the annular notch groove. The upper side of the oil seal 513-1 is provided with an elastic retaining ring 513-2 for holes. The elastic retaining ring 513-2 for the hole is embedded in the annular retaining ring groove opened on the inner peripheral surface of the annular notch groove of the sealing flange 513; the top surface of the sealing flange 513 is provided with an annular step, and the surface of the annular step is provided with an annular groove, A sealing ring 513-3 is installed in the annular groove, and the top surface of the sealing flange 513 and the bottom surface of the top plate of the centrifugal supergravity experiment chamber are sealed and matched through the sealing ring 513-3; the sealing flange 513 provides the main shaft complex and the vacuum of the centrifugal supergravity device Static sealing between experimental chambers. The sealing flange 513 is set and installed on the main shaft 59, and the sealing ring 513-3 that provides static sealing for the sealing flange 513 is installed in the groove 513-2, and the sealing flange 513 is installed on the top of the vacuum test chamber of the cardiac supergravity device by bolts. . The sealing ring 513-3 provides a seal for the sealing flange 513 to isolate the external atmospheric pressure and the internal vacuum chamber, with good sealing performance, long life, compact structure, and convenient assembly and disassembly.

The lower end of the main shaft 59 is coaxially fixed via an expansion sleeve 516 and a connecting flange 515, and the lower end of the connecting flange 515 is connected to the rotor system of the centrifugal supergravity device. When the main shaft 59 rotates at a high speed, the connecting flange 515 is fixed, and the expansion sleeve 516 rotates with the main shaft 59. The expansion sleeve 516 makes it easy to manufacture and install parts. Since the expansion sleeve 516 relies on friction transmission, there is no need to slot on the main shaft 59 to avoid the influence of the groove on the strength of the main shaft 59. The expansion sleeve 516 is easy to disassemble and has good interchangeability.

According to the torque and load transmitted by the main shaft 59, the selection principle of the expansion sleeve 516 is: transmission torque: M _t ≥a×M; bearing axial force: F _t ≥a×F _x ; transmission force: F _t ≥a×( F _x ² +(M×d×10 ^-3 /2) ² ) ^0.5 ; bearing radial force: P _t ≥a×F _r ×10 ³ /d/l, where: a: safety factor; M: required Transmitted torque, kN·m; Fx: axial force to withstand, kN; Ft: radial force to withstand, kN; Mt: rated torque of the expansion sleeve, kN·m; Ft: rated axial force of the expansion sleeve ; KN; d, l: the inner diameter of the expansion sleeve and the width of the inner ring, mm; Pt: the pressure on the joint surface of the expansion sleeve and the shaft, N/mm ² .

As shown in Figures 2 and 6, the main shaft 59 above the magnetic fluid seal structure 511 is partially provided with an annular outer flange as a collar portion. The inner peripheral surface is set as an inner conical surface inclined downward, that is, all are conical surfaces with a small upper end and a large lower end. The small pulley 510 is coaxially sleeved on the collar portion of the main shaft 59 through the inner and outer conical surfaces.

The small pulley 510 inputs torque to the spindle complex. The small pulley 510 is connected to the rotor system of the on-board device of the centrifugal supergravity device, and the small pulley 510 is connected to the main shaft 59 through the mounting hole to transmit the rotating torque to the main shaft 59. According to the needs, by adjusting the transmission ratio of the small pulley, it can meet the environment of different speeds, and it has strong adaptability and expandability. The power system of the small belt wheel 510 and the centrifugal supergravity device transmits torque through a flat belt. The flat belt is elastic, can relieve shock and vibration loads, runs smoothly, and is noise-free; when overloaded, the belt will slip on the wheel to prevent other The parts are damaged.

The oil seal 513-1 selects SKF fluorine rubber oil seal, which is suitable for high temperature resistance and high limit speed working environment, and provides a secondary dynamic seal for the spindle complex.

According to the above-mentioned structure of the present invention, in the torque output structure, the connecting flange 515 and the expansion sleeve 516 are designed, and the friction transmission characteristics of the expansion sleeve 516 are used. There is no need to slot on the surface of the main shaft 59 to avoid the influence of the groove on the strength of the main shaft 59. At the same time, when the main shaft 59 is overloaded, the expansion sleeve 516 expands and shrinks through the inner outer jacket to reduce the friction generated by the main shaft 59 and the containment surface of the expansion sleeve 516. With the help of the main shaft 59 and the expansion sleeve 516 rotating at different speeds, the opposite The overload protection of the main shaft 59; according to the load and speed, the transmission ratio of the small pulley 510 can be flexibly adjusted to meet the environment of different speeds, and it has strong adaptability and expandability. The power system of the small pulley 510 and the centrifugal supergravity device transmits torque through a flat belt. The flat belt is elastic, can relieve shock and vibration loads, runs smoothly, and is noise-free; when overloaded, the belt will slip on the wheel to prevent others The parts are damaged; the magnetic fluid sealing structure 511 is adopted to prevent the lubricating oil from volatilizing in the high vacuum environment, so that the present invention is suitable for the special working environment of long time, high vacuum, and super-rotation speed; the torque input structure is mounted on the top, and the torque output structure is mounted on the bottom. Under the same torque, the load of the main shaft 59 can be increased, and the load can be automatically leveled under the action of its own gravity; at high speeds, the load will be unstable or accidental, the load will pass through the expansion sleeve under the action of gravity and centrifugal force 516 automatically falls off from the spindle 59, which solves the key problem that the 17a down-drive spindle complex cannot achieve automatic leveling and the load is actively separated from the spindle 59 in an environment with a speed of more than 50,000 rpm, a load of more than 500 kg, and 10 ^{-2 Pa.} Simple structure, convenient installation and replacement, safe and reliable high-speed work.

The specific implementation process of the present invention is as follows:

The first step: Determine the safety factor a according to the torque and load transmitted by the main shaft, and then determine the model and key parameters of the expansion sleeve 516 according to the selection principle of the expansion sleeve 516.

Step 2: Vacuum requirements, determine whether a magnetic fluid sealing structure 511 is required; if the speed is less than 50,000 revolutions, under normal temperature conditions, the magnetic fluid sealing structure 511 is not required; if it is greater than 50,000 revolutions and the experimental temperature exceeds 1000 ℃, it must be used Magnetic fluid sealing structure 511.

Step 3: Assemble the upper-drive spindle complex:

Step 4: Check the upper-drive spindle complex and perform a dynamic balance test.

Step 5: Connect the assembled upper-drive spindle complex to the centrifugal supergravity device, and perform dynamic balance debugging again.

Claims

An upper-drive main shaft complex for a centrifugal supergravity device, which is characterized in that it includes a slip ring (51), a slip ring shaft (52), a main shaft (59), a small pulley (510), and a magnetic fluid sealing structure (511), sealing flange (513), connecting flange (515) and expansion sleeve (516);

The upper end of the main shaft (59) and the lower end of the slip ring shaft (52) are coaxially fixed. The upper end of the slip ring shaft (52) is fitted with a slip ring (51); the middle of the main shaft (59) is fitted with a magnetic fluid seal structure ( 511) and sealing flange (513); magnetic fluid sealing structure (511) includes bearing cap (511-2), deep groove ball bearing (511-3), housing (511-4) and O-ring (511- 7); The housing (511-4) is sleeved outside the main shaft (59), and there is a radial gap between the housing (511-4) and the middle of the main shaft (59) to form the inside of the swimming cavity (511-5) Deep groove ball bearings (511-3) are installed on both the upper side and the lower side, so that the housing (511-4) and the main shaft (59) are connected in rotation through the deep groove ball bearing (511-3), and the swimming cavity (511-5) The housing (511-4) at the upper port is open and installed with a bearing cover (511-2). The bearing cover (511-2) is sleeved on the outside of the main shaft (59) and axially aligns with the deep groove ball bearing (511-3) Limit; the housing (511-4) at the lower end of the housing (511-4) is closed to form a closed end, and the closed end of the lower end of the housing (511-4) is in a sealed connection with the main shaft (59) The lower end of the housing (511-4) is provided with an outer flange, the outer flange is provided with a connecting hole (511-6), and the bolt passes through the connecting hole (511-6) to connect to the top plate of the experimental chamber of the centrifugal supergravity device, Thereby, the lower end of the shell (511-4) is fixedly connected to the top plate of the centrifugal supergravity experiment chamber, and the lower end of the shell (511-4) is provided with an annular groove, and an O-ring (511) is installed in the annular groove. -7), through the O-ring (511-7), the lower end surface of the shell (511-4) and the top surface of the experimental cavity are sealed and matched;

The sealing flange (513) is provided with an annular notch groove on the peripheral surface of the top inner ring, an oil seal (513-1) is installed in the annular notch groove, and an elastic retaining ring (513-2) for the hole is installed on the upper side of the oil seal (513-1) ), an elastic retaining ring (513-2) for the hole is embedded in the annular retaining ring groove opened on the inner circumferential surface of the annular gap groove of the sealing flange (513); the top surface of the sealing flange (513) is provided with an annular step, which is annular An annular groove is provided on the surface of the step, and a sealing ring (513-3) is installed in the annular groove, and the top surface of the sealing flange (513) and the bottom surface of the top plate of the centrifugal supergravity experiment chamber are sealed and matched through the sealing ring (513-3); The lower end of the main shaft (59) is coaxially fixed with an expansion sleeve (516) and a connecting flange (515), and the lower end of the connecting flange (515) is connected with the rotor system of the centrifugal supergravity device.
An up-drive spindle complex for a centrifugal supergravity device according to claim 1, wherein the spindle (59) above the magnetic fluid sealing structure (511) is partially provided with an annular outer flange As the collar part, the outer peripheral surface of the collar part is set as an outer conical surface inclined downward, the inner peripheral surface of the small pulley (510) is set as an inner conical surface inclined downward, and the small pulley (510) passes through the inner and outer cones. The surface is coaxially sleeved on the collar part of the main shaft (59).
An up-drive spindle composite for a centrifugal supergravity device according to claim 1, characterized in that the oil seal (513-1) is selected SKF fluororubber oil seal.